string(26) "{"a":1,"b":2.3,"3":"test"}"
string(23) "["a",1,true,false,null]"
string(4) "null"
string(4) ""a?""
string(18) "["apple","banana"]"
string(15) "[{"a":"apple"}]"
string(36) "[
    {
        "a": "apple"
    }
]"
string(68) "[
    1,
    2,
    3,
    [
        1,
        2,
        3
    ]
]"
string(87) "{
    "a": 1,
    "b": [
        1,
        2
    ],
    "c": {
        "d": 42
    }
}"